Almost every exterior cleaning mistake we get called to fix comes from one confusion: treating “pressure washing” as the name of the whole trade rather than one technique within it. They are different jobs, they use different equipment, and using the wrong one on your house is how vinyl siding ends up with permanent lap marks.
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The short version
| Soft washing | Pressure washing | |
|---|---|---|
| Pressure at the surface | Roughly garden-hose level | High, delivered through a narrow tip or surface cleaner |
| What does the work | Detergent chemistry | Mechanical force |
| Kills growth at the root | Yes | No — removes what is visible |
| How long results last | 12–24 months | Often 6–10 weeks on organic growth |
| Right for | Siding, roofs, painted wood, stucco, masonry, screens | Concrete, driveways, walkways, patios, some hardscape |
| Risk if misapplied | Very low; mainly plant damage if rinsing is skipped | High — lap marks, water intrusion, granule loss, mortar erosion |
Figures on this page are typical for Richmond-area properties and are given as a guide, not a quote. Your firm price comes once we have seen the property.
Why growth comes back so fast after pressure washing
The green and black on a Richmond house is living: algae, mildew, mold, and on roofs a cyanobacteria called gloeocapsa magma. It is not sitting on the surface like dust. It has rooted into the texture of the siding, the shingle granules, or the pores of the masonry.
High pressure blasts off the visible top layer. It looks fantastic for a few weeks. But the roots are still there and still viable, so it regrows from exactly where it was, and in our humidity that takes a couple of months. A soft wash uses a detergent that kills the organism outright, which is the entire reason one holds for a year or two and the other does not.
That is the practical test when you compare quotes. If a cheaper contractor is offering to pressure wash your siding, you are not buying the same product for less money — you are buying a result that expires before the next season.
What high pressure actually does to siding
- Vinyl — laps are designed to shed water flowing downward. Pressure aimed upward or sideways drives water behind them, into the sheathing, where it does not dry.
- Hardie and fiber cement — the factory finish can be eroded, and the seams are a direct route for water.
- Painted wood — pressure finds any marginal paint adhesion and turns it into a peel.
- Stucco and EIFS — the least forgiving of all about water intrusion, and the most expensive to put right.
- Asphalt shingles — pressure strips the mineral granules that are the roof’s UV protection. This is not cosmetic; it shortens the roof’s life.
- Historic brick and lime mortar — soft mortar erodes out of the joint, and soft brick loses its fired face. Both are permanent.
Where pressure is the right answer
None of this means pressure washing is bad. On the right surface it is exactly what you want, and soft washing alone would be a waste of your money.
Concrete is the obvious case. A driveway, walkway, patio or pool deck genuinely benefits from real pressure delivered through a rotary surface cleaner, which lands it evenly instead of in stripes. Pre-treating for organic growth still helps it last longer, but the mechanical action is doing the heavy lifting. The same applies to most hardscape, retaining walls, and dumpster pads and loading docks on the commercial side.
The rule we work to is simple: if it is part of the building, it gets soft washed. If you walk or drive on it, it gets pressure. There are exceptions, but that gets you most of the way.
How to tell what a contractor is actually going to do
- Ask what pressure they will use on your siding. A straight answer that involves low pressure and a detergent is the one you want.
- Ask what they do before the mix goes on. If soaking the beds and lawn is not part of the answer, expect plant damage.
- Ask how long it will hold. Twelve to twenty-four months is a soft wash answer. Anyone quoting a season is telling you they are pressure washing.
- Ask about oxidized siding. A contractor who promises to restore chalky vinyl is either inexperienced or not being straight with you.
- Look at the equipment. A soft wash setup applies at volume and low pressure. A ladder and a wand pointed at a second-story wall is a different job.
Our own approach is on the house washing page, concrete is covered on the driveway and concrete page, and every number we charge is published on the Richmond pricing page.
Common questions
Is soft washing just pressure washing with soap?
No. The pressure is genuinely different — a soft wash applies at roughly garden-hose pressure, where a pressure washer is many times that. The detergent is doing the work, and the low pressure is what makes it safe on siding and roofs.
Which one does my house need?
Almost certainly both, on different surfaces. Siding and roof get soft washed. The driveway, walkway and patio get pressure. Most of our jobs are a combination, done in one visit.
Is soft washing more expensive?
No, they price similarly for comparable areas. What differs is how long the result lasts, which is where the actual value is.
Can pressure washing damage be repaired?
Sometimes, and usually not cheaply. Lap marks on vinyl do not come out. Granule loss on shingles is permanent. Eroded lime mortar means repointing. This is the main reason we are blunt about it.
My last contractor pressure washed my siding and it looked great. Was that wrong?
It probably did look great — for about two months. The question worth asking is how it looked the following spring compared with the year before. Damage from a single wash is often invisible at first, and water driven behind siding does not announce itself immediately.
Does soft washing work in winter?
On siding, yes, down to about freezing. Masonry we stop well before that, because water in brick that freezes causes spalling. We will tell you if a day is marginal rather than risk it.
Will soft washing hurt my plants?
Not when the beds are soaked before and rinsed after, which takes a few extra minutes and is not optional in our process. Nearly every story you hear about plant damage traces back to a crew skipping that step.
Do you ever pressure wash a house?
No. There is no situation where we will point high pressure at siding, and if that is specifically what you want, we are not the right contractor for the job.
📞 Call or Text (804) 571-7226 Get a Free Quote Most quotes go out the same day.